During the roasting of copper pyrites (), a specific flux is added to the reverberatory furnace to handle the predominant impurity. Which reaction correctly represents this slag formation?

Question

During the roasting of copper pyrites ($CuFeS_2$), a specific flux is added to the reverberatory furnace to handle the predominant impurity. Which reaction correctly represents this slag formation?

Prashant Kotian · Accepted Answer

Correct answer: B. Copper pyrites contain a significant iron impurity. During roasting, the iron is oxidized to . To remove this basic impurity, an acidic flux, Silica (), is added to the furnace to form a fusible slag of ferrous silicate ().

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